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Long‐Term Maintenance of Arytenoid Cartilage Abduction and Stability During Exercise After Laryngoplasty in 33 Horses
Author(s) -
Barnett Timothy P.,
O'Leary John Mark,
Parkin Timothy D.H.,
Dixon Padraic M.,
Barakzai Safia Z.
Publication year - 2013
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2013.01109.x
Subject(s) - medicine , arytenoid cartilage , surgery , laryngoplasty , larynx
Abstract Objectives To (1) assess long‐term maintenance of arytenoid cartilage abduction (ACA) after laryngoplasty (LP); and (2) correlate the residual grade of ACA and postoperative abductory loss with arytenoid cartilage stability (ACS) during exercise. Study Design Case series. Animals Horses re‐examined after laryngoplasty (n = 33). Methods Of 89 LP horses (2005–2010), 33 had historic ACA data available and upper airway endoscopy at rest and during over‐ground exercise (mean, 33 months; range, 4–71 months) after surgery. ACA grade at 1 and 6 weeks postoperatively were correlated to long‐term ACA grade. Effects of long‐term ACA grade and magnitude of postoperative abductory loss on ACS during exercise were investigated. Results Median ACA grade at 1 week (n = 33) was 2, reducing to grade 3 by week 6 (n = 16). Grade 3 abduction was maintained in the long‐term. Correlation between ACA at 1 week and the long‐term was poor (ρ = .43, P = .1), but there was good correlation between week 6 and long‐term (ρ = .89, P < .001). Arytenoid cartilage instability was observed during exercise in 7/33 of horses, and not significantly associated with the ACA grade ( P = .50), or the number of grades of ACA lost ( P = .64). Conclusions Limited abductory loss occurs after 6 weeks postoperatively. Resting ACA grade was not a useful predictor of ACS during exercise.